Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc44a21dc4b43bf2…

MALICIOUS

PDF

44.8 KB Created: 2020-11-09 04:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 548492876bf8bdec533a36e584e31cac SHA-1: 63e11f12aa0247dd5986956be3cd333e8c7ba8bc SHA-256: dc44a21dc4b43bf2820c1918eccafb91082e6f05194c89ec3eefd18de61cce7c
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/123?keyword=super+mario+combat+2+unblocked PDF link annotation
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f8877e63f635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5f900bc55f378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f8745fd10fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_5f938162894eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_5fa6c4074a78a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bb763b-a2f5-431b-9d8f-89e46c2dac16/jatokavarojig.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/sabusakuvuniza.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/conch_removal_ear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239732a4-4d1d-47c4-b6e8-194860036f71/xamuwawis.pdfIn PDF document text
    • https://zodanolafaxe.files.wordpress.com/2020/11/49656961361.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/definicin_de_inteligencia_emocional_goleman.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/19632888098.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/47933028978.pdfIn PDF document text
    • https://s3.amazonaws.com/tipakalif/wokozepazovofulenuli.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BD 5480 bytes
SHA-256: 57835140b8f34812d206b3dd71e4a5268440eae6e4cdf8fa4042e26c83263c20
font_01_sfnt_off00007742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7742 14560 bytes
SHA-256: a22b4c318bcfbcb00c5ab404fd5fcd2c95b1cf7cd35c2b4ceaa2c57662ae7d43